/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2008-2011, Salzburg Research. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * - Neither the name of the LMF library client Project nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * Contributor(s):
 * Stephanie Stroka
 *
 * File Info:
 * User: Stephanie Stroka
 * Date: 2011/08/19
 * Time: 18:04
 *
 * Project: lmflib
 */

package kiwi.facading.model;

import kiwi.facading.model.resources.KiWiLiteral;
import kiwi.facading.model.resources.KiWiNode;
import kiwi.facading.model.resources.KiWiResource;
import kiwi.facading.model.resources.KiWiUriResource;

/**
 * @author Stephanie Stroka
 * User: sstroka
 * Date: 31.05.2011
 * Time: 12:54:50
 */
public class KiWiTriple {

    private KiWiResource subject;

    private KiWiUriResource property;

    private KiWiNode object;

    private KiWiUriResource context;

    private KiWiResource creator;

    public KiWiTriple() {
    }

    public KiWiTriple(KiWiResource subject, KiWiUriResource property, KiWiNode object, KiWiUriResource context) {
		this();
		this.subject = subject;
		this.property = property;
		this.object   = object;
        this.context  = context;

        assert(subject  != null);
        assert(property != null);
        assert(object   != null);
    }
    
        /**
     * Get the object of this extended triple.
     * @return
     */
    public KiWiNode getObject() {
        return object;
    }

    /**
     * Set the object of this extended triple to the given KiWiNode (either a resource or a literal)
     * @param object
     */
    public void setObject(KiWiNode object) {
        this.object = object;
    }

    /**
     * Get the property of this extended triple. Always a KiWiUriResource.
     * @return
     */
    public KiWiUriResource getProperty() {
        return property;
    }

    /**
     * Set the property of this extended triple. Always needs to be a KiWiUriResource
     * @param property
     */
    public void setProperty(KiWiUriResource property) {
        this.property = property;
    }

    /**
     * Get the subject of this extended triple. Always a resource.
     * @return
     */
    public KiWiResource getSubject() {
        return subject;
    }

    /**
     * Set the subject of this extended triple to the provided KiWiResource
     * @param subject
     */
    public void setSubject(KiWiResource subject) {
        this.subject = subject;
    }

    /**
     * Get the unique triple identifier of this extended triple. Returns a KiWiUriResource identifying this triple.
     * @return
     */
    public KiWiUriResource getContext() {
        return context;
    }

    /**
     * Set the unique triple identifier of this extended triple to the provided KiWiUriResource. The caller needs
     * to ensure that the tripleId is unique over the KiWi system; otherwise, the system might not function correctly.
     * @param context
     */
    public void setContext(KiWiUriResource context) {
        this.context = context;
    }

    /**
     * Return the author of this extended triple.
     *
     * Internally, this is determined using the tripleId of the extended triple and looking it up in the
     * database.
     *
     * @return
     */
    public KiWiResource getCreator() {
        return creator;
    }

    /**
     * Set the author of this extended triple.
     *
     * Changes will be persisted as part of the database using the tripleId as unique identifier.
     *
     * @param author
     */
    public void setCreator(KiWiResource author) {
        this.creator = author;
    }

    public String toN3() {
        if(object.isUriResource() || object.isAnonymousResource()) {
            return "<"+subject.toString()+"> <" + property.toString() + "> <" + object.toString() + ">";
        } else if(object.isLiteral()) {
            return "<"+subject.toString()+"> <" + property.toString() + "> \"" + ((KiWiLiteral) object).getContent() + "\"";
        }
        return "";
	}

    public String toTurtle() {
        return subject.toTurtle() + " " + property.toTurtle() + " " + object.toTurtle() + " .\n";
    }

    public String toJSON() {
        return "{ " + subject.toJSON(false) + " : { " + property.toJSON(false) + " : [" + object.toJSON(true) + "] } }";
    }

}
